Teaching Hess's Law

John Davik

doi:10.1021/ed057p895

Hess's law of constant heat summation

Encyclopedic Dictionary of Polymers ◽

10.1007/978-0-387-30160-0_5820 ◽

2007 ◽

pp. 491-491

Keyword(s):

Constant Heat ◽

Hess’S Law

Stepwise Approach to Hess’s Law Using Household Desiccants: A Laboratory Learning Program for High School Chemistry Courses

Journal of Chemical Education ◽

10.1021/acs.jchemed.9b00492 ◽

2019 ◽

Vol 97 (1) ◽

pp. 166-171 ◽

Cited By ~ 2

Author(s):

Satoki Kodani ◽

Masahiro Fukuda ◽

Yoji Tsuboi ◽

Nobuyoshi Koga

Keyword(s):

High School ◽

Learning Program ◽

High School Chemistry ◽

Stepwise Approach ◽

Hess’S Law ◽

Laboratory Learning

Hess's Law of Constant Heat Summation

Encyclopedic Dictionary of Polymers ◽

10.1007/978-1-4419-6247-8_5912 ◽

2011 ◽

pp. 364-364

Author(s):

Jan W. Gooch

Keyword(s):

Constant Heat ◽

Hess’S Law

Theoretical Research on Cage-like Oxadiazole-based Energetic Compounds and Its Derivatives

10.21203/rs.3.rs-351924/v1 ◽

2021 ◽

Author(s):

Yan Huang ◽

Le-Wu Zhan ◽

Qian Zhang ◽

Jing Hou ◽

Bindong Li

Keyword(s):

Energetic Materials ◽

Function Theory ◽

Density Function Theory ◽

Fukui Function ◽

Theoretical Research ◽

Lower Sensitivity ◽

Detonation Properties ◽

Energetic Compounds ◽

Molecular Stability ◽

Hess’S Law

Abstract In this manuscript, we reported the design and prediction of two oxadiazole-based cage-like molecules and their derivatives using density function theory (DFT). The heats formation and detonation properties were calculated using Hess’s law and Kamlet-Jacobs equations with B3PW91 method. The molecular stability and geometry were analyzed using M06-2X method and molecular crystal structures were predicted based on Monte Carlo simulation, while chemical reactive sites were judged using PBE0 method based on Fukui function. The theoretical calculation result proved that the designed molecules exhibit ideal symmetric cage-like geometry and show superior physicochemical and detonation properties. Compared with traditional energetic materials, the designed molecules display more positive solid heats formation and lower sensitivity. The designed molecules could be considered as promising HEDM candidates with potential synthesis and application value.

Thermochemical Equations; Hess's Law

Fundamentals of Chemistry Laboratory Studies ◽

10.1016/b978-0-12-395583-8.50036-5 ◽

1966 ◽

pp. 151-154

Author(s):

FRANK BRESCIA ◽

JOHN ARENTS ◽

HERBERT MEISLICH ◽

AMOS TURK

Keyword(s):

Hess’S Law

Enthalpy and thermochemistry

10.1093/oso/9780198782957.003.0006 ◽

2018 ◽

Author(s):

Dennis Sherwood ◽

Paul Dalby

Keyword(s):

Worked Examples ◽

Phase Changes ◽

Enthalpies Of Formation ◽

Exothermic Reactions ◽

Enthalpy Changes ◽

Hess’S Law ◽

Standard Enthalpies Of Formation ◽

And Mathematics ◽

Definition Of

Definition and mathematics of enthalpy. Definition of heat capacity at constant pressure as CP = (∂H/∂T)V. Endothermic and exothermic reactions. Role of the change in enthalpy as regards the direction and spontaneity of a change in state. Enthalpy changes and phase changes. Measuring enthalpy changes by calorimetry. Hess’s law of constant heat formation. Chemical standards and standard states. Standard enthalpies of formation, ionic enthalpies and bond energies. How the change in enthalpy varies with temperature. Kirchhoff’s equations. Applications of thermochemistry to a variety of worked examples, including flames and explosions.

Hess's Law

Hawley's Condensed Chemical Dictionary ◽

10.1002/9780470114735.hawley08291 ◽

2007 ◽

Keyword(s):

Hess’S Law

Another method for solving problems based on Hess's law

Journal of Chemical Education ◽

10.1021/ed060p362.1 ◽

1983 ◽

Vol 60 (4) ◽

pp. 362

Author(s):

Robert Sutcliffe

Keyword(s):

Hess’S Law

Thermodynamics I: Internal energy, enthalpy, first law of thermodynamics, state functions, and Hess's law

RSC Paperbacks - A Working Method Approach for Introductory Physical Chemistry Calculations ◽

10.1039/9781847550033-00017 ◽

2007 ◽

pp. 17-23

Keyword(s):

Internal Energy ◽

First Law Of Thermodynamics ◽

Hess’S Law ◽

State Functions

Synthesis and Standard Molar Formation Enthalpy of Plate Shape NaZnPO4·H2O

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.121-126.175 ◽

2011 ◽

Vol 121-126 ◽

pp. 175-180

Author(s):

Shao Mei Ma ◽

Sheng Fu Wu ◽

Zeng Wei Huang ◽

An Ping Liao ◽

Ai Qun Yuan

Keyword(s):

Formation Enthalpy ◽

Thermochemical Study ◽

X Ray Diffraction ◽

Reaction Enthalpy ◽

X Ray ◽

Hess’S Law ◽

Isoperibol Calorimeter ◽

Dissolution Enthalpies ◽

Plate Shape ◽

Solution Calorimeter

Plate shape NaZnPO4·H2O was synthesized by solid-state reaction at low temperature and characterized by X-Ray Diffraction, Scanning electron microscope and elemental analysis. Thermochemical study was performed with an isoperibol solution calorimeter. Based on Hess’s law, thermochemical cycl was designed to determine the dissolution enthalpies of reactants and products using a solution-reaction isoperibol calorimeter at 298.15 K, and the molar reaction enthalpy was calculated on the basis of above dissolution enthalpies. The results show that the obtained product is plate shape NaZnPO4·H2O. The standard molar formation enthalpy of the NaZnPO4·H2O is ΔfHm [NaZnPO4·H2O,s]= -1967.18 ± 0.69 kJ•mol-1.